Hi Roger,
the code is not on my website yet. But you can use everything from the LL distribution. It’s the same I have except some more samples (that are also in LL24 - L25).
I will update my website soon.
Regarding your problem: That the relation is missing is not a problem of DP code (C#, ABL) it’s because of the - probably - missing unique index on the po. Have you checked this?
If you decide to use LL26 please also have a look at this here OpenEdge DataProvider Bug in LL26
You can also send me your entire dataset (via email) and I can have a look at it and try it locally.
Best regards,
Thomas